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posix: Fix macro expansion producing 'defined' has undefined behavior

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The NEED_CHECK_SPEC is defined as:

  #define NEED_CHECK_SPEC \
    (!defined _XBS5_ILP32_OFF32 || !defined _XBS5_ILP32_OFFBIG \
     || !defined _XBS5_LP64_OFF64 || !defined _XBS5_LPBIG_OFFBIG \
     || !defined _POSIX_V6_ILP32_OFF32 || !defined _POSIX_V6_ILP32_OFFBIG \
     || !defined _POSIX_V6_LP64_OFF64 || !defined _POSIX_V6_LPBIG_OFFBIG \
     || !defined _POSIX_V7_ILP32_OFF32 || !defined _POSIX_V7_ILP32_OFFBIG \
     || !defined _POSIX_V7_LP64_OFF64 || !defined _POSIX_V7_LPBIG_OFFBIG)

Which is undefined behavior accordingly to C Standard (Preprocessing
directives, p4).

Checked on x86_64-linux-gnu.
This commit is contained in:
Adhemerval Zanella 2022-03-09 18:22:46 -03:00
parent 6c4ee1aba1
commit ddcf5a9170
1 changed files with 7 additions and 3 deletions
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10
sysdeps/posix/sysconf.c
View File

@ -37,13 +37,17 @@
#define NEED_SPEC_ARRAY 0
#include <posix-conf-vars.h>
#define NEED_CHECK_SPEC \
(!defined _XBS5_ILP32_OFF32 || !defined _XBS5_ILP32_OFFBIG \
#if !defined _XBS5_ILP32_OFF32 || !defined _XBS5_ILP32_OFFBIG \
|| !defined _XBS5_LP64_OFF64 || !defined _XBS5_LPBIG_OFFBIG \
|| !defined _POSIX_V6_ILP32_OFF32 || !defined _POSIX_V6_ILP32_OFFBIG \
|| !defined _POSIX_V6_LP64_OFF64 || !defined _POSIX_V6_LPBIG_OFFBIG \
|| !defined _POSIX_V7_ILP32_OFF32 || !defined _POSIX_V7_ILP32_OFFBIG \
|| !defined _POSIX_V7_LP64_OFF64 || !defined _POSIX_V7_LPBIG_OFFBIG)
|| !defined _POSIX_V7_LP64_OFF64 || !defined _POSIX_V7_LPBIG_OFFBIG
# define NEED_CHECK_SPEC 1
#else
# define NEED_CHECK_SPEC 0
#endif
#if NEED_CHECK_SPEC
static long int __sysconf_check_spec (const char *spec);
#endif